Sure, some combination will fit, but if you could share more about your Camaro, that could help. When you say it has discs, what do you mean? OE front discs with drums in the rear? Aftermarket discs all around? Is you car lowered at all? If so, how much? Spring or spindle?
In general, an 18x8.5 wheel is going to be tight up front with a 235 to 245/40R18 tire, but it can be made to fit with the right backspacing. You may rub a little at full lock, but nothing a little work on the steering stops can't take care of. Since the Summit Legend's are somewhat limited with respect to backspacing options, you'd probably need to run the 5.125" BS wheel up front as the 4.5" BS will put you into your fender for sure if you have or want the typical P-T stance. You can always reduce the BS with a spacer if you have to...going the other way is a bit more involved.
You definitely can't beat the price of those summit wheels. It somewhat depends on whether you can live with any rubbing at all. On the front, 245 40 18s are close everywhere, so close that the extra caster from aftermarket upper control arms can move the tire rearward enough to slightly scrape the rear of the inner wheelwell when turning. The same can happen at the top of the inner wheelwell with not enough neg camber. A 245/35 wont have near as many problems, but it is an inch shorter than the 40 series and looks a little short in the fender. The main space issues on the inside are the steering arm and rubbing the frame when at full lock, on the outside its the inner fender at the top during bump and the inner fender when turning. The practical limit of space to the outside is a 8 inch wheel with 4.75 backspacing.
18x8 with 5 inch backspacing and a 245/40 is perfect
18x8.5 with 5.5 BS would be good, but may not fit if you have long steering arms.
18x8.5 with 6 BS is kind of uncharted territory, It will have steering arm and possibly a-arm clearance issues which will have to be solved, and will require steering limiters
With the right a-arms, steering arm mods, inner fender mods, and living with limited steering, you could probably make a 18x9.5 with 6 inch BS work. It might take two turns to get in a parking space though.
On the rear, people say a 18x9.5 with a 275 works with 5.5 BS, but my 67 hits on the inside with a 16x8 with 4.75 BS and a 255/50. My 68 is minitubbed so I haven't given the rear as much thought.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
Summit Legend 5 Wheels ----- 1968 Camaro
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